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| Jupiter and Saturn as seen from central Seoul on the 21st, the day Jupiter and Saturn have been closest to the sky since 1623. After the proximity of Jupiter and Saturn, the two planets will be closer to each other in 2080. 2020.12.21 / News1 © News1 Reporter Yoo Seung-gwan |
On the afternoon of the 21st, a “close-up” phenomenon occurred, where Jupiter and Saturn were very close.
There was a report of a space show only for ‘400 years’, and there was a report of a space show only for ‘800 years’. Which of the two is right?
In conclusion, ‘both’ is correct. In terms of “spatial phenomena”, 400 years is correct, and 800 years is correct in the standard that it can be easily observed so that it is called a “how” in space.
Approximately 397 years and 5 months after July 16, 1623, Jupiter and Saturn appear close to each other. In 1623, it became known that the Sun, Jupiter, and Saturn were close to each other, making it difficult to observe the planets due to sunlight.
If so, would it have been seen at sunset or before sunrise? To check this, an open source astronomy simulator program called ‘Stelarium’ was used. This program shows the sky observed from Earth through calculations.
At 7:32 p.m. on July 16, 1623, the sun sets, but Jupiter and Saturn are invisible. As it continues to expand, you can see the point where Jupiter and Saturn meet, and when it expands further, Jupiter and Saturn separate. Later, as time progresses, Saturn and Jupiter get closer, but fall below the horizon. This day it seemed too close to the sun, making it difficult to observe.
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| Jupiter and Saturn hovering in the northwestern sky at 7:32 pm on July 16, 1623 (from above) Viewing angles 235 °, 52.4 °, 9.9 °, 0.493 ° (Stellarium capture) 2020.12. 21 / News 1 |
Since Earth, Jupiter, and Saturn move periodically, the relative positions of Earth-Jupiter-Saturn, which determine how they look on Earth, also repeat periodically. If you return from December 21, 2020 to 145161 days, you will get July 16, 1623, and if you return from this day to 145161 days, you will get March 5, 1226. At dawn on this day, you can see that Jupiter and Saturn is approaching before the sun rises, and they are close enough to be compared to the proximity of 1623.
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| Jupiter and Saturn hovering in the southeastern sky at 5:32 am on March 5, 1226 (from above) Viewing angles 235 °, 52.4 °, 9.9 °, 0.493 ° (Stellarium capture) 2020.12. 21 / News 1 |
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| Jupiter (green) and Saturn (blue) at 7:32 pm (bottom) on July 16, 1623 and 5:32 am (above) on March 5, 1226, 0.493 ° angle of view (Stellarium capture ) 2020.12 .21 / News 1 |
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